Former world champion Parker produced a positive sample in a anti-doping examination administered the very day he faced 11th-round loss against British heavyweight Fabio Wardley.
Wardley together with Joseph Parker participated in a thrilling bout held in London last October to decide the next WBO mandatory challenger against reigning heavyweight king Oleksandr Usyk.
Parker had positioned himself as the leading contender to challenge Usyk subsequent to putting together a remarkable six wins in a row, yet put his shot at the title on the line in the UK and endured an 11th-round defeat.
A routine test administered to Parker by the Voluntary Anti-Doping Agency the day of the match showed an adverse result and now leaves the veteran boxer facing a challenge to clear his name.
His promotion team published an announcement declaring: "The agency alerted all relevant parties that Joseph Parker returned an adverse finding following an anti-doping test conducted on the fight day. As the investigation continues, no additional comment will be made for now."
The New Zealand boxer earned the title of titleholder in 2016 prior to he lost his championship belt via unanimous decision to British star Joshua at the Millennium Stadium two years later.
Joseph Parker remained an active participant in the UK from that point, fighting eight times in total in Britain and relocating to Dublin for fight camps with highly regarded trainer former champion Lee over the past few years.
Under the tutelage of Lee, Joseph Parker bounced back from his defeat in 2022 to British heavyweight Joyce to chalk up multiple wins positioning him front of the queue to meet Usyk before he was defeated against Wardley.
Following Parker's sample showed an adverse finding when he fought Wardley, allegedly for cocaine, a probe regarding the results has been started.
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